Structure-based mechanism of lipoteichoic acid synthesis by Staphylococcus aureus LtaS.

Experimental Data Snapshot

  • Resolution: 1.20 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.171 

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Structure-Based Mechanism of Lipoteichoic Acid Synthesis by Staphylococcus Aureus Ltas.

Lu, D.Wormann, M.E.Zhang, X.Schneewind, O.Grundling, A.Freemont, P.S.

(2009) Proc Natl Acad Sci U S A 106: 1584

  • DOI: https://doi.org/10.1073/pnas.0809020106
  • Primary Citation of Related Structures:  
    2W5Q, 2W5R, 2W5S, 2W5T

  • PubMed Abstract: 

    Staphylococcus aureus synthesizes polyglycerol-phosphate lipoteichoic acid (LTA) from phosphatidylglycerol. LtaS, a predicted membrane protein with 5 N-terminal transmembrane helices followed by a large extracellular part (eLtaS), is required for staphylococcal growth and LTA synthesis. Here, we report the first crystal structure of the eLtaS domain at 1.2-A resolution and show that it assumes a sulfatase-like fold with an alpha/beta core and a C-terminal part composed of 4 anti-parallel beta-strands and a long alpha-helix. Overlaying eLtaS with sulfatase structures identified active site residues, which were confirmed by alanine substitution mutagenesis and in vivo enzyme function assays. The cocrystal structure with glycerol-phosphate and the coordination of a Mn(2+) cation allowed us to propose a reaction mechanism, whereby the active site threonine of LtaS functions as nucleophile for phosphatidylglycerol hydrolysis and formation of a covalent threonine-glycerolphosphate intermediate. These results will aid in the development of LtaS-specific inhibitors for S. aureus and many other Gram-positive pathogens.

  • Organizational Affiliation

    Division of Molecular Biosciences, Department of Microbiology, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Membrane Entity: Yes 
Find proteins for Q7A1I3 (Staphylococcus aureus (strain MW2))
Explore Q7A1I3 
Go to UniProtKB:  Q7A1I3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7A1I3
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 1.20 Å
  • R-Value Free: 0.185 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.171 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.214α = 90
b = 57.123β = 90
c = 159.452γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-02-03
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-05-08
    Changes: Data collection, Database references, Derived calculations, Other